Propeller-wheel.



No. 657,348. Patented Sept. 4, i900.

.C. E. JOHNSON.

PBOPELLEB WHEEL.

(Application filed June 26, 1899.)

(No Modal.)

UNITED STATES I PATENT OFFICE.

CHARLES EDWARD JOHNSON, OF CHICAGO, ILLINOIS.

PROPELLER-WHEEL.

SPECIFICATION forming part of Letters P Application filed June 26, 1899.

To all whom it may concern.-

Be it known that I, CHARLES EDWARD JOHNSON, a citizen of the United States of America, and a resident of the city of Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in Propeller-Wheels, of which the following is a specification. l

The object of my invention is to produce a propeller-wh eel that will offer the least resistance in passing through the water and at the same time will give the greatest efiect-ive working surface to propel the vessel; and the invention consists in the novel construction set forth in the claims hereof.

Reference will be had to the accompanying drawings, in which- Figure 1 is a side elevation of my invention. Fig. 218 anend elevation. Fig. 3 is a top plan view. Fig. 4 is a section of one of the arms on line 4 4 of Fig. 1. Fig. 5 isasectional detail on line 5 5 of Fig. 2. Fig. 6 is a perspective view of the leading end of the spiral blade.

In the drawings, H designates an axial shaft,

and B a spiral blade located as if wound upon a large cylinder having that shaft as an axis. The spiral blade makes a little more than a complete turn about its axis and its lead is such thatit presents to the water faces suit ably inclined for obtaining the proper propelling effect when it is revolved.

A A A are propeller-blad es rigidly uniting, respectively, the leading end, the middle, and the following end of the spiral blade to the shaft H. Each blade is set at the proper angle, has sharp edges, and at its outer end has its faces near theedges continuous with the working faces of the spiral blade. Although the blades A are set at different points along the shaft, their form and angular spacing are such that when seen as in Fig. 2 looking along the line of the shaft they appear to form an ordinary propeller having three equally-spaced blades with equal intermediate spaces. The end portions of the blade B arebent or rounded to lie approximately in Serial No. 721,341. (No model.)

' body of the blade is curved forward, giving a sharp edge from end to end of this member.

The propeller is shown as provided with a tapering recess in the forward end of the shaft H to receive the correspondingly-tapered end of a power-shaft S; but instead of having this detachable connection the propeller may, if desired, be made integral with the power-shaft.

Although this propeller may be used in any situation where ordinary propellers are employed, it is especially intended to be made relatively larger and to be used, partly submerged, upon boats of light draft, or to be used either partly or wholly submerged in ca nals, where to avoid washing the banks it is desirable to have a large surface and slow revolution.

The use of this propeller produces practically no vibration, since the ends of the spiral blade strike no appreciable blow in entering the water, for they are narrow, sharp, and not inclined to the direction of movement, and the sharp-edged body of the spiral aids in dividing the water for the propeller-blades to which the spiral blade is attached.

' What I claim is 1. A propeller consisting of a shaft, a spiral blade encircling the shaft but at some distance from it, and propeller-blades rigidly joining the leading end, the middle, and the following end, of the spiral blade to the shaft and themselves having equal angular spacing about the shaft.

2. A propellerconsisting of an axial shaft, a spiral blade located as if wound upon a large cylinder having the same axis as the shaft and having its end portions approximately in planes perpendicular to said shaft, and propeller-blades rigidly joining the leading end,

the middle, we The following end of thespiral blade to the shaft. v

3. A propeller consisting of a shaft, a spiral blade located as if "wound upon a large cylinder having the shaft as its axis and ,hav-' ing its end portions bent into position approximately in planes perpendicular to the,

axis of the shaft, and propeller-blades, each [0 having sharp edges meeting respectively the faces of r the spiral blade, integrally connectiai'g "the leading end, the middle, eand' the following end, respectively, to said shaft.

Signed by me at Chicago, Illinois, this 22d day of June, 1899.

CHARLES EDWARD JOHNSON.

Witnesses:

PAUL COWELL, Jr.,

GRAoE FERN. 

